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Finding the Fourth Proportional to 71,736.48, 99,000 and 39,906

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Solution

The fourth proportional to 71,736.48, 99,000 and 39,906 is: 55,072.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,736.48 : 99,000 = 39,906 : x
  2. Step 2: Convert to fraction form
    71,736.48/99,000 = 39,906/x
  3. Step 3: Cross multiply
    71,736.48x = 99,000 × 39,906
  4. Step 4: Simplify right side
    71,736.48x = 3,950,694,000
  5. Step 5: Solve for x
    x = 3,950,694,000/71,736.48
  6. Step 6: Final answer
    x = 55,072.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.